A method is presented of expressing Net Positive Suction Head for centrifugal pumps in terms of the impeller design elements as they appear in the inlet velocity triangle. The procedure is applicable to pumps of different specific speeds, of different suction specific speeds, and to pumps having impellers of either the overhung type or with a shaft through the eye. The suggested relationship represents another “dissimilarity law” to supplement those previously discussed by the authors [1].

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